Extrusive Rock: igneous rock formed from lava that erupted onto Earth's surface. Intrusive Rock: igneous rock formed from magma, hardens beneath Earth's surface. Porphyritic Texture: a rock with large crystals scattered on a background of much smaller crystals.
Outline:
Igneous Rocks
Earth's surface- glowing mass of molten material
Characteristics of Igneous Rock
igneous rock classified according to origin. texture, mineral composition
Igneous Rocks 5.2
Vocabulary:
Extrusive Rock: igneous rock formed from lava that erupted onto Earth's surface.
Intrusive Rock: igneous rock formed from magma, hardens beneath Earth's surface.
Porphyritic Texture: a rock with large crystals scattered on a background of much smaller crystals.
Outline: